Understanding and mastering the magnetic properties of domain walls in cylindrical nanowires is a fundamental pillar for developing novel 3D information technologies. For this purpose, a good comprehension of domain walls (DW) dynamical properties, which are strongly dependent on its type and size, is needed. In this work by means of micromagnetic simulations, we focus on the accurate determination of DW types (transverse, vortex-antivortex, and the Bloch point) and width and present a state diagram as a function of the diameter and the nanowire material. Using different initial states and trajectories we find a large region of metastability where the Bloch-point domain wall co-exists with either transverse or a more energetical vortex-antivortex one. We determine the domain wall width and its dependence on the nanowire diameter either for the transverse or the vortex-antivortex domain wall showing that it is always larger than the nanowire diameter. We also find simple expressions for the DW widths and the critical diameter for the transition between different DW types which agree well with direct simulations. Our results will be useful for the experimental design of cylindrical nanowires for multiple applications.

理解和掌握圆柱形纳米线畴壁的磁性是开发新型 3D 信息技术的基本支柱。为此，需要很好地理解畴壁 (DW) 动力学特性，这在很大程度上取决于其类型和尺寸。在这项通过微磁模拟的工作中，我们专注于精确确定 DW 类型（横向、涡旋反涡旋和布洛赫点）和宽度，并呈现作为直径和纳米线材料的函数的状态图。使用不同的初始状态和轨迹，我们发现了一个大的亚稳态区域，其中 Bloch 点畴壁与横向或更能量的涡旋-反涡旋壁共存。我们确定畴壁宽度及其对横向或涡旋-反涡旋畴壁的纳米线直径的依赖性，表明它总是大于纳米线直径。我们还发现了 DW 宽度和不同 DW 类型之间过渡的临界直径的简单表达式，这些表达式与直接模拟非常吻合。我们的结果将对用于多种应用的圆柱形纳米线的实验设计有用。